It’s hanging underneath your car at the back exposed to the elements.
Vehicle modifications can take many forms, from simple modifications such as light window tinting to under-vehicle LED lighting to the more complex frame and suspension modifications.
Underneath your vehicle are several series of different systems that keep your vehicle in fine working order, including your exhaust system which connects the metal brackets on the exhaust pipe and muffler to the undercarriage through the use of very thick rubber dampers.
The muffler on a vehicle is designed to reduce the amount of noise coming from the exhaust system of your automobile.
Your car came from the automaker with a stock muffler.